With the increasing stringency on sulfur content in petrodiesel, there is a growing tendency of broader usage of ultra low sulfur diesel (ULSD) with sulfur limit of 15 ppm. Refineries should develop cost- effective and sustainable strategies to meet the requirement. In addition to the conventional approach of revamping existing hydrotreating facilities, blending petrodiesel with biodiesel is a potentially attractive option. In this work, petrodiesel and biodiesel production processes were simulated. Next, process integration techniques were employed to optimize the processes,...